On the other hand, because microvascular invasion (MVI) is the direct evidence of the micro metastasis in hepatocellular carcinoma, it will decrease recurrence rate for the patients with a high MVI risk, if the investigators increase the resection margin width during the surgery? Shanghai Eastern Hepatobiliary Surgery Hospital which the investigators affiliated with had ever conducted a retrospective analysis on consecutive 3263 patients with HCC hepatectomy, the results indicated that a wide resection margin（≥1cm）can benefit those patients with microvascular invasion , nevertheless, the benefit will not present if patients are without microvascular invasion.